create member function bug

there's a small bug in the argument type creation of "create missing member functions". i'm having the following definition to select span from boost or stl:

namespace ni {
#if __cpp_lib_span >= 202002L
using std::span;
#else
using boost::span;
#endif
}

and implementing a class like:

namespace ni {
class foo
{
  void bar(ni::span<int>);
};
}

if i use "create missing member functions", the generated code has the wrong signature for `ni::span` (my cmake configuration is c++20, so `__cpp_lib_span == true`):

namespace ni {
foo::bar(ni::boost::span<int>);
}